Implimented broadcast encryption (testing)
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Jonathan Warren
parent
afd644a97d
commit
896b96b7c7
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@ -590,7 +590,7 @@ class receiveDataThread(QThread):
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broadcastVersion, broadcastVersionLength = decodeVarint(data[readPosition:readPosition+9])
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readPosition += broadcastVersionLength
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if broadcastVersion < 1 or broadcastVersion > 2:
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#Cannot decode incoming broadcast versions higher than 2. Assuming the sender isn\' being silly, you should upgrade Bitmessage because this message shall be ignored.
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print 'Cannot decode incoming broadcast versions higher than 2. Assuming the sender isn\' being silly, you should upgrade Bitmessage because this message shall be ignored.'
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return
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if broadcastVersion == 1:
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beginningOfPubkeyPosition = readPosition #used when we add the pubkey to our pubkey table
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@ -704,9 +704,8 @@ class receiveDataThread(QThread):
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printLock.release()
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if broadcastVersion == 2:
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cleartextStreamNumber, cleartextStreamNumberLength = decodeVarint(data[readPosition:readPosition+10])
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readPosition += streamNumberLength
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readPosition += cleartextStreamNumberLength
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initialDecryptionSuccessful = False
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for key, cryptorObject in MyECSubscriptionCryptorObjects.items():
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try:
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decryptedData = cryptorObject.decrypt(data[readPosition:])
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@ -756,6 +755,12 @@ class receiveDataThread(QThread):
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ripe = hashlib.new('ripemd160')
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ripe.update(sha.digest())
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if toRipe != ripe.digest():
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print 'The encryption key used to encrypt this message doesn\'t match the keys inbedded in the message itself. Ignoring message.'
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return
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else:
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print 'The encryption key DOES match the keys in the message.'
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messageEncodingType, messageEncodingTypeLength = decodeVarint(decryptedData[readPosition:readPosition+9])
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if messageEncodingType == 0:
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return
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@ -2265,6 +2270,27 @@ def isAddressInMyAddressBook(address):
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sqlLock.release()
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return queryreturn != []
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def isAddressInMyAddressBookSubscriptionsListOrWhitelist(address):
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if isAddressInMyAddressBook(address):
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return True
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sqlLock.acquire()
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sqlSubmitQueue.put('''SELECT address FROM whitelist where address=? and enabled = '1' ''')
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sqlSubmitQueue.put((address,))
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queryreturn = sqlReturnQueue.get()
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sqlLock.release()
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if queryreturn <> []:
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return True
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sqlLock.acquire()
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sqlSubmitQueue.put('''select address from subscriptions where address=? and enabled = '1' ''')
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sqlSubmitQueue.put((address,))
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queryreturn = sqlReturnQueue.get()
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sqlLock.release()
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if queryreturn <> []:
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return True
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return False
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def assembleVersionMessage(remoteHost,remotePort,myStreamNumber):
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global softwareVersion
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payload = ''
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@ -2383,6 +2409,9 @@ class sqlThread(QThread):
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self.cur.execute( '''CREATE TABLE pubkeys (hash blob, transmitdata blob, time int, usedpersonally text, UNIQUE(hash) ON CONFLICT REPLACE)''' )
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self.cur.execute( '''INSERT INTO pubkeys SELECT hash, transmitdata, time, usedpersonally FROM pubkeys_backup;''')
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self.cur.execute( '''DROP TABLE pubkeys_backup;''')
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print 'Deleting all pubkeys from inventory. They will be redownloaded and then saved with the correct times.'
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self.cur.execute( '''delete from inventory where objecttype = 'pubkey';''')
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print 'Commiting.'
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self.conn.commit()
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print 'Vacuuming message.dat. You might notice that the file size gets much smaller.'
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self.cur.execute( ''' VACUUM ''')
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@ -2844,7 +2873,6 @@ class singleWorker(QThread):
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signature = highlevelcrypto.sign(payload,privSigningKeyHex)
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dataToEncrypt += encodeVarint(len(signature))
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dataToEncrypt += signature
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print 'The string that we will hash to make the privEncryptionKey is', (encodeVarint(addressVersionNumber)+encodeVarint(streamNumber)+ripe).encode('hex')
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privEncryptionKey = hashlib.sha512(encodeVarint(addressVersionNumber)+encodeVarint(streamNumber)+ripe).digest()[:32]
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pubEncryptionKey = pointMult(privEncryptionKey)
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payload += highlevelcrypto.encrypt(dataToEncrypt,pubEncryptionKey.encode('hex'))
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@ -2964,8 +2992,13 @@ class singleWorker(QThread):
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payload += pubSigningKey[1:] #The \x04 on the beginning of the public keys are not sent. This way there is only one acceptable way to encode and send a public key.
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payload += pubEncryptionKey[1:]
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payload += encodeVarint(config.getint(fromaddress,'noncetrialsperbyte'))#todo: check and see whether the addressee is in our address book, subscription list, or whitelist and set lower POW requirement if yes.
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payload += encodeVarint(config.getint(fromaddress,'payloadlengthextrabytes'))
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#If the receiver of our message is in our address book, subscriptions list, or whitelist then we will allow them to do the network-minimum proof of work. Let us check to see if the receiver is in any of those lists.
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if isAddressInMyAddressBookSubscriptionsListOrWhitelist(toaddress):
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payload += encodeVarint(networkDefaultProofOfWorkNonceTrialsPerByte)
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payload += encodeVarint(networkDefaultPayloadLengthExtraBytes)
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else:
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payload += encodeVarint(config.getint(fromaddress,'noncetrialsperbyte'))
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payload += encodeVarint(config.getint(fromaddress,'payloadlengthextrabytes'))
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payload += toHash #This hash will be checked by the receiver of the message to verify that toHash belongs to them. This prevents a Surreptitious Forwarding Attack.
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payload += '\x02' #Type 2 is simple UTF-8 message encoding as specified on the Protocol Specification on the Bitmessage Wiki.
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@ -3024,17 +3057,11 @@ class singleWorker(QThread):
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nonce = 0
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trialValue = 99999999999999999999
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encodedStreamNumber = encodeVarint(toStreamNumber)
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#We are now dropping the unencrypted data in payload since it has already been encrypted and replacing it with the encrypted payload that we will send out.
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payload = embeddedTime + encodedStreamNumber + encrypted
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payload = embeddedTime + encodeVarint(toStreamNumber) + encrypted
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target = 2**64 / ((len(payload)+requiredPayloadLengthExtraBytes+8) * requiredAverageProofOfWorkNonceTrialsPerByte)
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printLock.acquire()
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print '(For msg message) Doing proof of work. Target:', target
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print 'Using requiredAverageProofOfWorkNonceTrialsPerByte', requiredAverageProofOfWorkNonceTrialsPerByte
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print 'Using requiredPayloadLengthExtraBytes =', requiredPayloadLengthExtraBytes
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print 'The required total difficulty is', float(requiredAverageProofOfWorkNonceTrialsPerByte)/networkDefaultProofOfWorkNonceTrialsPerByte
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print 'The required small message difficulty is', float(requiredPayloadLengthExtraBytes)/networkDefaultPayloadLengthExtraBytes
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print '(For msg message) Doing proof of work. Total required difficulty:', float(requiredAverageProofOfWorkNonceTrialsPerByte)/networkDefaultProofOfWorkNonceTrialsPerByte,'Required small message difficulty:', float(requiredPayloadLengthExtraBytes)/networkDefaultPayloadLengthExtraBytes
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printLock.release()
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powStartTime = time.time()
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initialHash = hashlib.sha512(payload).digest()
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@ -3107,8 +3134,7 @@ class singleWorker(QThread):
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def generateFullAckMessage(self,ackdata,toStreamNumber,embeddedTime):
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nonce = 0
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trialValue = 99999999999999999999
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encodedStreamNumber = encodeVarint(toStreamNumber)
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payload = embeddedTime + encodedStreamNumber + ackdata
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payload = embeddedTime + encodeVarint(toStreamNumber) + ackdata
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target = 2**64 / ((len(payload)+networkDefaultPayloadLengthExtraBytes+8) * networkDefaultProofOfWorkNonceTrialsPerByte)
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printLock.acquire()
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print '(For ack message) Doing proof of work...'
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@ -3146,7 +3172,6 @@ class addressGenerator(QThread):
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def run(self):
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if self.addressVersionNumber == 3:
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if self.deterministicPassphrase == "":
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statusbar = 'Generating one new address'
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self.emit(SIGNAL("updateStatusBar(PyQt_PyObject)"),statusbar)
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